Physics Exam Past Questions and Answers | JAMB, WAEC and NECO

Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.

• Question 931:

  

  Which of the following bodies, each with centre of gravity G, lying on a horizontal table, is/are in unstable equilibrium?

  Options:
  A) II only
  B) III only
  C) I and IV only
  D) II and III only
  Show Answer
  The correct answer is B .
• Question 932: An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.
  [specific heat capacity of water = 4.2 x 10³ jkg^-1 k^-1] Options:
  A) 1.05 x 10³s
  B) 1.05 x 10⁵s
  C) 1.05 x 10²s
  D) 1.05 x 10⁴s
  Show Answer
  The correct answer is A .
• Question 933: Which of the following is NOT a part of a d.c. electric motor? Options:
  A) Field-magnet
  B) Armature
  C) Commutator
  D) Transformer
  Show Answer
  The correct answer is D .
• Question 934:

  

  The wire X in the figure above is at right angles to the plane of the paper and carries a current into the paper. at which of the points labelled 1-4, will the magnetic flux density due to this current be in the same direction as that of the horizontal component of earth's magnetic field

  Options:
  A) 1
  B) 2
  C) 3
  D) 4
  Show Answer
  The correct answer is C .
• Question 935:

  Neutrons were discovered by

  Options:
  A) Faraday
  B) Dalton
  C) James Chadwick
  D) Rutherford
  Show Answer
  The correct answer is C .
• Question 936:

  The main factor which affects the speed of sound wave is the?

  Options:
  A) properties of the medium
  B) amplitude of the sound wave
  C) intensity of the sound wave
  D) loudness of the sound wave
  Show Answer
  The correct answer is A .
• Question 937: The value of x, y and z respectively in the expression M^xL^yT^z for the universal gravitational constant G are Options:
  A) 2, -3, -2
  B) -1, 3, -2
  C) -1, 2, -3
  D) -2, -1, 3
  Show Answer
  The correct answer is B .
• Question 938: During a thunderstorm, the sound is heard over a long time. this phenomenon is referred to as Options:
  A) diffraction of sound
  B) refraction of sound
  C) superposition
  D) reveraberation
  Show Answer
  The correct answer is D .
• Question 939: The sound of an electricity bell dies down slowly when air is slowly pumped out from a bottle because Options:
  A) the wavelength of sound becomes greater in the bottle
  B) sound cannot pass through the bottle
  C) sound needs a material medium
  D) sound can pass through a vacuum
  Show Answer
  The correct answer is C .
• Question 940: What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds? Options:
  A) 80Hz
  B) 600Hz
  C) 800Hz
  D) 1600Hz
  Show Answer
  The correct answer is C .